Accessory system



June '9, 1953 A. RAPPL 2,641,107

ACCESSORY SYSTEM Filed April 20, 1948 INVENTOR' Ana on Rap/d ATTO R NEY` Patented June 9, 1953 UNITED STATES PATENT OFFICE ACCESSORY SYSTEMAnton Rappl, Eggertsville, N. Y., assigner to Trico ProductsCorporation, Buffalo, N. Y.

Application April 20, 1948, Serial No. 22,141

5 Claims. 1

This invention relates to the automotive art and more especially to afuel feeding system for internal combustion engines and to a motor foroperating the same.

It has heretofore been proposed to utilize the manifold suctioninfluence and to supplement this by a pump during intervals when themanifold supply became decient. The pump was brought into function by aswitch responsive to the manifold suction but since the manifoldpressure iniiuence is ever fluctuating it is apparent that the pumpwould unnecessarily start and stop at frequent intervals.

An object of the present invention is to provide a fuel feeding systemwhich is more practical and satisfactory in performance. Further, theinvention has for its object to make the system directly responsive tothe fuel demand of the invention .in such manner that the secondarysource of pressure is precluded against unnecessary operation.

Again, the invention resides in a practical fluid motor drive which isreadily adapted to a standard fuel pump for producing an efficient pumpunit.

The invention further has for its object to provide an efficient pumpunit and a valve therefore which are economical of manufacture, ofdurable construction, and one in which the valve is more readily insureda sealed iit upon its seat.

The foregoing and other objects will manifest themselves as thisdescription progresses, reference being had to the accompanying drawingwherein Fig. l is a diagrammatic layout of a fuel feeding systemembodying the present invention;

Fig. 2 is a vertical sectional view through the pump thereof; and

Fig. 3 is a cross sectional view of the valve about on line III-III ofFig. 2.

Referring more particularly to the drawing, the numeral I' designatesthe intake manifold of an automobile engine, 2 the suction line leadingtherefrom, the usual fuel pump, 4 another accessory such as a windshieldcleaner, and 5 a rotary pump which is driven by an electric motor 6,This pump may be generally of the design shown in Patent Number2,520,650 through which the suction line 2 extends from both accessories3 and l to the manifold for enabling the manifold influence to beoperatively impressed upon the accessories when the pump is inoperative.A switch l', inserted in the suction line, is connected in circuit withthe electric motor 6 and a source of electrical energy and is designedto open the motor circuit when the manifold suction is ample foraccessory operation.

motivating fluid pressure.

The fuel pump is interposed in the fuel line 9 adjacent a sediment trapI0 and includes a piston or diaphragm I I which is normally under anurge from spring I2 to displace fuel to the usual carburetor I3. Aswitch I4 in the motor circuit is normally closed by a spring I5 and isadapted to be opened byl a diaphragm I6 in response to the pump pressureon the fuel. It will therefore be observed that whenever the Vehicleengine is in operation the pressure supplementing pump 5 and itselectric motor 5 are only energized when both the manifold suction andthe fuel supply pressure are low or inadequate. Both pressure responsiveswitches must be in a circuit closing condition concurrently. The usualignition key switch Il will open. the motor circuit when the engine isarrested, and when the ignition switch is again closed to restart theengine, the fuel pump will immediately function to supply an ample fuelflow providing conditions are favorable for such purpose.

In accordance with the present invention a novel fluid motor is providedto actuate the fuel displacing member II, the same comprising arelatively larger piston or diaphragm I8 and a chamber I9, withautomatic valve mechanism connectedthereto for operatively applying theThis uid motor is designed for attachment to the usual fuel pump 3 by anadaptor housing section 2U, which may To complete the inrod 22 forcoupling to the fuel displacing member I I, as by passing the threadedend 23 through an opening 24 in the fuel displacing member and fixing itthere by a nut 25. This readily adapts the iiuid motor for attachment toa standard pump. The spring I2 which determines the maximum pressure ofthe delivered fuel is conveniently incorporated in the fluid motor toserve the added function of returning the motor piston I8 to itselevated position shown.

The automatic Valve mechanism is also controlled by this spring andcomprises a pressure reversing valve 26 slidable back and forth in achamber 2'! between two operative positions. In one such position arecess 28 in the valve connects a suction supply port 2Q in the chamberwall to one end of a passage 3i! which communicates with one end of asecond chamber 3l, while a venting recess 32 in the valve serves to ventthe opposite end of the second chamber to the atmosphere through asecond passage 33 and an atmospheric port 34. A shuttle Valve 35 slideswithin the second chamber 3l and has a recess 36.

With suction or subatmospheric pressure being supplied to the port 29 bythe suction line 2, this arrangement of port connections will cause theresulting pressure differential in chamber 3l to shift the shuttle valve35 to its upper position wherein its bridging recess 3E will connect thesuction supply port 3'I to the motor chamber port 38. With -the'uppenside of thepistonlikediaphragm` I 8 Abeing open to the atmospherethrough one or more holes 39 and the lower side exposed to the suctioninfluence, a pressure differential will follow to depress the diaphragmagainst the tension of spring I2. As the diaphragm descends it will pulldown the smalleludiaphragm II to intake a charge of fuel. The pressurereversing valve 25, being connected to the diaphragm I8 by a playconnection 49, will move toits lower or other operative position,wherein a second venting recess 4I connects the passage 30 to' the sec-0nd atmospheric port 42 and the suction supply port 29 is joined to thepassage33 by the recess 28. This arrangement of portconnections willreverse the pressure differential upon the shuttle valve and move it toits lower position to blocl;

l voif the suction communication -withthe motor l,

chamber I9 and open the latter to the atmosphere by reason ofr thepassage 43 in the shuttle valve 35v coming to rest in registry with thechamber port 38 and an atmospheric port 414.

The operative positions for the shuttle valve and the pressure reversingvalve may be determined by guide screws 45 and Q6, respectively,operating between opposing shoulders on the valve-s. The shuttle valvemay have a light frictional t inthe chamber 3 I.

The pressure reversing valve 26 is unique both in design and inoperation, the same having its seat engaging face, in which therecesses'28, 32 'and 4I are formed, constituting a part of a cylin derthe radius of which is less than that of its similarly shaped chamber 21with whichl it has tangential contact along lthe series of recesses. Inother words, the cylindrical valve is slightly less in diameter than itscylindrical chamber and while providing a loose fit, it does not detractfrom its eicient performance since the pressure differential acts uponthe valve to hold it firmly to the seat with a light seal. One of itschief advantages is the economy of manufacture. Both the valve and itschamber may be shaped truly cylindrical and being nearly of the samediameter any clearance between the edges of the recesses and the chamberwall will be infinitesimal and not detrimental to the proper functioningof the valve.

1. A fuel system for motor vehicles, comprising 'a fuel pump, pressureactuated means for operat- This, in contrast to a flat-valve and thefitting of the same to its flat face, is a much ing the same, a suctionsupply line from the intake manifold of the vehicle engine to said meansfor supplying the actuating pressure, a suction supplementing pump inthe line, an electric drive for the suction pump, and means responsiveto the fuel pressure as delivered by the fuel pump and also responsiveto the manifold suction influence. inthe line for energizing theelectric drive. 2. A fuel system for motor vehicles, `comprising a fuelpump, pressure actuated means for operat- `ing the same, a suctionsupply line from the intake manifold of the vehicle engine to said meansfor supplying the actuating pressure, a suction supplementing pump inthe line, an electric drive for the suction pump, a normally closedswitch in circuit with the drive and responsive to the fuel pressurefrom the fuel pump for opening the circuit, and a second normally closedswitch arranged in the circuit in series with the rst switch andresponsive to the manifold iniuence in the line for opening the circuit.

3. A fuel system for motor vehicles, comprising a fuel pump, pressureactuated means for operating the same, a suction supply line from theintake manifold of the vehicle engine to said means for supplyingthefactuatng pressure, a suction supplementing pump in the line, anelectric drive for the suction pump, a normally closed switch in circuitwith the drive and responsive to the fuel pressure from the fuel pumpforopening the circuit, a second normally closed switch arranged in thecircuit in series with the first switch and responsive to the manifoldinfluence in the line for opening the circuit, and manual means foropening the circuit.

` 4. An accessory system for motor vehicles, comprising an accessorymotory such as a windshield cleaner, a fuel pump, pressure actuatedmeans for operating the fuel pump, a suction supply line from the intakemanifold of the vehicle engine to said means for supplying the actuatingpressure, a suction supplementing pump in the line, an electric drivefor the suction pump, means responsive to the fuel pressure as deliveredby the fuel pump and also responsive to the manifold suction influencein* the line for energizing the electric drive, and means connecting theacceslsory to the suction supply line for operation by the manifoldsuction influence independently of the-suction supplementing pump.

5. A fuel system for motor vehicles, comprising a fuel pump, pressureactuated means for operating the same, electric means operable to supplyIthe actuating pressure to the first means, means responsive tothepressure on the fuel delivered by the pump for energizing theelectric means, in combination with the ignition circuit of the motorvehicle engine in such manner that the circuit for said electric meanswill be open when the ignition switch is open.

ANTON RAPPL.

References Cited in the le of this patent UNITED STATES PATENTS

